A Louisiana homeowner was quoted $24,000 to add a Tesla Powerwall 3 to an existing Powerwall 2. Reddit’s r/solar commenters called the estimate unusually high, while a separate debate in the thread questioned whether the two battery generations can be paired.
The top commenter said the quote for the 13.5-kWh Powerwall 3 was $8,000–$10,000 above California prices; another said they would expect to pay no more than $10,000. Compatibility was disputed: after one user said the models could not be integrated, the homeowner linked Tesla’s backward-compatibility page. Another commenter said Tesla had released installer training through its portal the previous month, but that limitations applied.
